On Marine Radar Near- Surface Current Mapping
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1 On Marine Radar Near- Surface Current Mapping Björn Lund 1, Brian Haus 1, Jochen Horstmann 2, Hans Graber 1, and CARTHE team 1 University of Miami, 2 Helmholtz Zentrum Geesthacht
2 LASER Experiment Sources: carthe.org/blog, greenwaveinstruments.com
3 LASER Experiment Sources: carthe.org/blog, greenwaveinstruments.com
4 Science Marine X-band Radar Specs 9.4 GHz (X-band) 2.3 m HH polarized antenna 12.5 m antenna height 2 s antenna period 2 khz pulse frequency 10.5 m range resolution Coherent on receive Developed at HZG
5 Data Overview Green: good data Orange: data corrupted and/or incomplete Red: system down or failed collecting data Gray: at sea periods
6 Marine Radar Calibration Maximize contrast of land targets by iteratively correcting: Azimuthal misalignment ( 2.92 ) Range offset ( 15 m) Temporal offset (0 s) Based on McCann & Bell, 2015 Before:
7 Marine Radar Calibration Maximize contrast of land targets by iteratively correcting: Azimuthal misalignment ( 2.92 ) Range offset ( 15 m) Temporal offset (0 s) Following McCann & Bell, 2015 After:
8 Operational Support 2-min-averaged, georeferenced, ramp-corrected, and normalized radar return Image shows current / salinity front, Masco 8, small boats Radar system not radiometrically calibrated
9 Current Front Evolution Marine radar images: Allow tracking of frontal features Provide context for field work activities
10 Current Front Evolution Marine radar images: Allow tracking of frontal features Provide context for field work activities
11 Near-surface Current Retrieval Near-surface current mapping is based on surface wave signal: Convert sequence of radar images to Fourier space Obtain current from wave coordinates Doppler shift, using least-squares fit
12 Near-surface Current Retrieval Near-surface current mapping is based on surface wave signal: Convert sequence of radar images to Fourier space Obtain current from wave coordinates Doppler shift, using least-squares fit
13 Near-surface Current Retrieval 3D FFT
14 Near-surface Current Retrieval Analysis box radius of m (~0.7 km 2 ) 40% max overlap between neighboring boxes ~30 min max analysis period
15 Near-surface Current Retrieval Analysis box radius of m (~0.7 km 2 ) 40% max overlap between neighboring boxes ~30 min max analysis period
16 Near-surface Current Retrieval Analysis box radius of m (~0.7 km 2 ) 40% max overlap between neighboring boxes ~30 min max analysis period
17 Near-surface Current Retrieval Analysis box radius of m (~0.7 km 2 ) 40% max overlap between neighboring boxes ~30 min max analysis period
18 Near-surface Current Retrieval Analysis box radius of m (~0.7 km 2 ) 40% max overlap between neighboring boxes ~30 min max analysis period
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20 Normalized Divergence Convergent flow where backscatter intensity peaks (frontal feature) Red: downwelling Blue: upwelling
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28 Radar Drifter Comparison Analysis periods (with gaps): (1) 01/20, 16:00 UTC- 01/21, 19:00 UTC (2) 01/25, 17:00 UTC- 01/26, 22:00 UTC (3) 01/28, 17:00 UTC- 02/01, 13:00 UTC (4) 02/06, 06:00 UTC- 02/07, 21:00 UTC (5) 02/10, 22:00 UTC- 02/12, 19:00 UTC
29 Radar Drifter Comparison
30 Radar Drifter Comparison
31 Conclusions Calibrated marine radar images show frontal features (as well as slicks, wind rows, ), guiding field work activities and providing context for data analysis Marine radar near-surface current maps compared against LASER drifter measurements For 4,130 radar drifter data pairs (almost 6 days of data), standard deviations of differences are 4 cm s 1 and 12 for current speed and direction Part of radar drifter differences can be explained by different sampling depths / vertical current shear Frontal features / bands of enhanced radar backscatter coincide with strong convergence (downwelling)
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